Why would a guy say that he is in a relationship when he is not?

Men like to tell us that they are simple creatures. They say if he likes you, He'll tell you. But if he doesn't, he'll tell you. But why does this guy whom I've dated in the past we have a ton of History I've known him since I was 13 we didn't end on the best of terms because we were both young and we're learning to heal the unhealed parts of ourselves. We've had plans to meet and he's canceled them all last minute. Which mind you every cancelation makes sense. However I asked him how his girlfriend was because last I knew he was in a relationship and he told me they were fine and he proceeded to defend this relationship ( at the time her and her child's father were engaged, now they're married) with this woman. Only they've been broken up for over a month and he has not been with anyone else. Why not just tell me you're not interested in me?

Why would a guy say that he is in a relationship when he is not?
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